function changelogin() {
    document.getElementById('titlebutton2').style.display="block";
    document.getElementById('titlebutton2').style.margin="auto";
    document.getElementById('titlebutton1').style.display="none";
    document.getElementById('phonelogin').style.display="block";
    document.getElementById('passwordlogin').style.display="none";
}
function changelogin2() {
    document.getElementById('titlebutton1').style.display="block";
    document.getElementById('titlebutton1').style.margin="auto";
    document.getElementById('titlebutton2').style.display="none";
    document.getElementById('passwordlogin').style.display="block";
    document.getElementById('phonelogin').style.display="none";
}
